To be able to trace and account for order of the folio.
Based on include/trace/filemap.h.
Update MAINTAINERS file list for SHMEM.
Signed-off-by: Daniel Gomez <da.gomez@xxxxxxxxxxx>
---
MAINTAINERS | 1 +
include/trace/events/shmem.h | 52 ++++++++++++++++++++++++++++++++++++
mm/shmem.c | 4 +++
3 files changed, 57 insertions(+)
create mode 100644 include/trace/events/shmem.h
diff --git a/MAINTAINERS b/MAINTAINERS
index bdc4638b2df5..befa63e7cb28 100644
--- a/MAINTAINERS
+++ b/MAINTAINERS
@@ -21923,6 +21923,7 @@ M: Hugh Dickins <hughd@xxxxxxxxxx>
L: linux-mm@xxxxxxxxx
S: Maintained
F: include/linux/shmem_fs.h
+F: include/trace/events/shmem.h
F: mm/shmem.c
TOMOYO SECURITY MODULE
diff --git a/include/trace/events/shmem.h b/include/trace/events/shmem.h
new file mode 100644
index 000000000000..223f78f11457
--- /dev/null
+++ b/include/trace/events/shmem.h
@@ -0,0 +1,52 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM shmem
+
+#if !defined(_TRACE_SHMEM_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_SHMEM_H
+
+#include <linux/types.h>
+#include <linux/tracepoint.h>
+
+DECLARE_EVENT_CLASS(mm_shmem_op_page_cache,
+
+ TP_PROTO(struct folio *folio),
+
+ TP_ARGS(folio),
+
+ TP_STRUCT__entry(
+ __field(unsigned long, pfn)
+ __field(unsigned long, i_ino)
+ __field(unsigned long, index)
+ __field(dev_t, s_dev)
+ __field(unsigned char, order)
+ ),
+
+ TP_fast_assign(
+ __entry->pfn = folio_pfn(folio);
+ __entry->i_ino = folio->mapping->host->i_ino;
+ __entry->index = folio->index;
+ if (folio->mapping->host->i_sb)
+ __entry->s_dev = folio->mapping->host->i_sb->s_dev;
+ else
+ __entry->s_dev = folio->mapping->host->i_rdev;
+ __entry->order = folio_order(folio);
+ ),
+
+ TP_printk("dev %d:%d ino %lx pfn=0x%lx ofs=%lu order=%u",
+ MAJOR(__entry->s_dev), MINOR(__entry->s_dev),
+ __entry->i_ino,
+ __entry->pfn,
+ __entry->index << PAGE_SHIFT,
+ __entry->order)
+);
+
+DEFINE_EVENT(mm_shmem_op_page_cache, mm_shmem_add_to_page_cache,
+ TP_PROTO(struct folio *folio),
+ TP_ARGS(folio)
+ );
+
+#endif /* _TRACE_SHMEM_H */
+
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/mm/shmem.c b/mm/shmem.c
index ab31d2880e5d..e2893cf2287f 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -84,6 +84,9 @@ static struct vfsmount *shm_mnt __ro_after_init;
#include "internal.h"
+#define CREATE_TRACE_POINTS
+#include <trace/events/shmem.h>
+
#define VM_ACCT(size) (PAGE_ALIGN(size) >> PAGE_SHIFT)
/* Pretend that each entry is of this size in directory's i_size */
@@ -1726,6 +1729,7 @@ static struct folio *shmem_alloc_and_add_folio(gfp_t gfp,
}
}
+ trace_mm_shmem_add_to_page_cache(folio);
shmem_recalc_inode(inode, pages, 0);
folio_add_lru(folio);
return folio;
--
2.39.2
